CN218769387U - Temperature fuse assembly and circuit breaker - Google Patents
Temperature fuse assembly and circuit breaker Download PDFInfo
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- CN218769387U CN218769387U CN202221250919.2U CN202221250919U CN218769387U CN 218769387 U CN218769387 U CN 218769387U CN 202221250919 U CN202221250919 U CN 202221250919U CN 218769387 U CN218769387 U CN 218769387U
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Abstract
The utility model provides a temperature fuse subassembly and circuit breaker, include: a first temperature fuse, a turn-off circuit, and an arc extinguishing circuit; the two ends of the first temperature fuse are used for connecting a direct current power supply and a load, and the turn-off loop and the arc extinguishing loop are connected in series and then connected with the first temperature fuse in parallel; the arc extinguishing loop is configured to be capable of continuing to conduct the direct current power supply and the load when the first temperature fuse is sensed to be disconnected, so that an arc generated when the first temperature fuse is disconnected is extinguished; the turn-off loop is configured to sense the current and/or temperature of the loop after the arc extinguishing loop is turned on, and to turn off when the current and/or temperature is abnormal. The arc generated by the high-voltage circuit can be quickly extinguished.
Description
Technical Field
The utility model relates to a high voltage direct current field, in particular to temperature fuse subassembly and circuit breaker.
Background
The common temperature fuse is used in a direct current circuit with rated voltage AC250V, rated current 1-15A or low voltage and low current of a temperature fuse in a household appliance, but with the development of new energy automobiles, higher requirements are provided for the rated voltage and the rated current of the temperature fuse, and the temperature fuse can resist different specifications of direct current voltage 600V, even direct current voltage 1000V, rated current 1-30A and the like. When the conventional temperature fuse is used for DC600V and the temperature needs to be cut off, an arc generated by the DC voltage of 600V is difficult to extinguish, so that the temperature fuse cannot be normally cut off.
In view of this, the present application is proposed.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a temperature fuse subassembly and circuit breaker can extinguish the electric arc that high-voltage circuit produced fast.
The utility model discloses a first embodiment provides a temperature fuse subassembly, include: a first temperature fuse, a turn-off circuit, and an arc extinguishing circuit;
the two ends of the first temperature fuse are used for connecting a direct current power supply and a load, and the turn-off loop and the arc extinguishing loop are connected in series and then connected with the first temperature fuse in parallel;
the arc extinguishing loop is configured to be capable of continuing to conduct the direct current power supply and the load when the first temperature fuse is sensed to be disconnected, so that an arc generated when the first temperature fuse is disconnected is extinguished;
the shutdown loop is configured to sense current and/or temperature of the loop after the quenching loop is turned on and to be turned off when the current and/or temperature is abnormal.
Preferably, the quenching circuit comprises a varistor;
the first end of the piezoresistor is connected with the first end of the first temperature fuse, and the first end of the piezoresistor is connected with the turn-off loop.
Preferably, the turn-off circuit comprises a second temperature fuse, a resistor;
the first end of the resistor is electrically connected with the arc extinguishing loop, and the second end of the resistor is connected with the second end of the first temperature fuse through the second temperature fuse.
Preferably, the turn-off circuit comprises a current fuse, a second temperature fuse and a resistor;
the first end of the resistor is electrically connected with the arc extinguishing loop, the second end of the second resistor of the resistor is connected with the first end of the current fuse through the second temperature fuse, and the second end of the current fuse is connected with the second end of the first temperature fuse.
Preferably, the turn-off loop comprises a current fuse, a resistor;
the first end of the resistor is electrically connected with the arc extinguishing loop, and the second end of the resistor is connected with the second end of the first temperature fuse through the current fuse.
Preferably, the turn-off circuit comprises a current fuse;
the first end of the current fuse is electrically connected with the arc extinguishing loop, and the second end of the current fuse is connected with the second end of the first temperature fuse.
Preferably, the second temperature fuse has an operating temperature higher than that of the first temperature fuse.
A second embodiment of the present invention provides a circuit breaker, including a temperature fuse assembly as described above.
Based on the utility model provides a pair of temperature fuse subassembly and circuit breaker, in normal course of operation, the electric current of direct current power supply and load passes through first temperature fuse, turn-off circuit and the out of work of arc extinguishing return circuit this moment are that the electric current can not flow through these two return circuits, and when first temperature fuse perception temperature was unusual, it can be automatic and quick fusing, in the twinkling of an eye of fusing, can continue to switch on when the arc extinguishing return circuit breaks direct current power supply with the load, extinguish in order to realize the electric arc that produces when first temperature fuse breaks, if electric current and/or temperature continue to keep when unusual, turn-off circuit disconnection cuts off whole return circuit, should understand, when turn-off return circuit and arc extinguishing return circuit switch on for the electric current in return circuit diminishes, at this moment, can not produce electric arc, or produce less electric arc and can extinguish naturally fast.
Drawings
Fig. 1 is a schematic circuit diagram of a thermal fuse assembly provided by the present invention;
fig. 2 is a schematic circuit diagram of a thermal fuse assembly according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a thermal fuse assembly according to another embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a thermal fuse assembly according to another embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a thermal fuse assembly according to another embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
The utility model discloses a temperature fuse subassembly and circuit breaker can extinguish the electric arc that high-voltage circuit produced fast.
Referring to fig. 1, a first embodiment of the present invention provides a thermal fuse assembly, including: a first temperature fuse 1, a turn-off circuit 2, and an arc extinguishing circuit 3;
the two ends of the first temperature fuse 1 are used for connecting a direct current power supply and a load, and the turn-off loop 2 and the arc extinguishing loop 3 are connected in series and then connected in parallel with the first temperature fuse 1;
the arc extinguishing loop 3 is configured to be capable of continuing to conduct the direct current power supply and the load when sensing that the first temperature fuse 1 is disconnected, so as to extinguish an arc generated when the first temperature fuse 1 is disconnected;
the shutdown loop 2 is configured to sense the current and/or temperature of the loop after the quenching loop 3 is turned on, and to be turned off when the current and/or temperature is abnormal.
The inventors have found that, as the voltage class of the electric devices is required to be increased, the conventional thermal fuse needs to be opened at a high voltage class, and the generated arc is hardly extinguished, so that the thermal fuse cannot be normally opened, and the electric devices are likely to be broken.
In this embodiment, in a process that a dc power source normally supplies power to a load, currents of the dc power source and the load pass through the first temperature fuse 1, and at this time, the shutdown loop 2 and the arc extinguishing loop 3 do not work, that is, the currents do not flow through the two loops, when the first temperature fuse 1 senses temperature abnormality, the first temperature fuse can be automatically and rapidly fused, and at the moment of fusing, when the arc extinguishing loop 3 is disconnected, the dc power source and the load can be continuously conducted, so as to extinguish an arc generated when the first temperature fuse 1 is disconnected, if the currents and/or the temperatures continue to be abnormal, the shutdown loop 2 is disconnected, and the whole loop is cut off.
In a possible embodiment of the present invention, the arc extinguishing circuit 3 may include a varistor R1;
the first end of the piezoresistor R1 is connected with the first end of the first temperature fuse 1, and the first end of the piezoresistor R1 is connected with the turn-off loop 2.
It should be noted that, at the moment when the first temperature fuse 1 is disconnected, the voltage across the varistor R1 exceeds the varistor voltage thereof, and the shutdown circuit 2 and the arc extinguishing circuit 3 are instantly turned on (i.e., the dc power supply and the load are continuously turned on), so as to ensure that the first temperature fuse 1 realizes arc extinguishing at the moment of fusing, and thus safely disconnects the first temperature fuse, it should be understood that, at this moment, the circuit in which the varistor R1 is located is still in a conducting state, and when the current flowing through the shutdown circuit 2 and the arc extinguishing circuit 3 exceeds the response current and/or the temperature generated by the current is greater than the response temperature, the shutdown circuit 2 is disconnected, and the whole circuit is cut off.
It should be noted that, in this embodiment, the number of the piezoresistors R1 may be one or more, which is not specifically limited herein, but these solutions are all within the protection scope of the present invention.
Referring to fig. 2, in one possible embodiment of the present invention, the turn-off circuit 2 includes a second thermal fuse 311 and a resistor 312;
a first end of the resistor 312 is electrically connected to the arc extinguishing circuit 3, and a second end of the resistor 312 is connected to a second end of the first thermal fuse 1 through the second thermal fuse 311.
It should be noted that, at the moment when the first temperature fuse 1 is disconnected, the voltage across the varistor 312R1 exceeds the varistor voltage, and the shutdown circuit 2 and the arc extinguishing circuit 3 are instantly turned on (i.e., the dc power supply and the load are continuously turned on), so as to ensure that the arc extinguishing is implemented at the moment when the first temperature fuse 1 is fused, and the first temperature fuse 1 is safely disconnected. However, the loop of the voltage dependent resistor 312R1 is still in a conducting state, the series resistor 312 is used to greatly reduce the loop current to a current that can safely disconnect the second thermal fuse 311, and when the abnormal temperature continues to rise, the second thermal fuse 311 responds to the safe disconnection to cut off the whole circuit.
It should be noted that in this embodiment, the number of the second thermal fuse 311 and the resistor 312 may be one or more, which is not specifically limited herein, but these solutions are all within the protection scope of the present invention.
Referring to fig. 3, in one possible embodiment of the present invention, the shutdown loop 2 includes a current fuse 322, a second temperature fuse 323, and a resistor 321;
a first end of the resistor 321 is electrically connected to the arc extinguishing circuit 3, a second end of a second resistor 321 of the resistor 321 is connected to the first end of the current fuse 322 through the second thermal fuse 323, and a second end of the current fuse 322 is connected to the second end of the first thermal fuse 1.
When the first thermal fuse 1 is disconnected, the voltage across the varistor 321R1 exceeds the varistor voltage, and the shutdown circuit 2 and the arc extinguishing circuit 3 are turned on instantaneously (i.e., the dc power supply and the load are continuously turned on), so that the first thermal fuse 1 can be protected from instantaneous arc extinguishing and can be safely disconnected. However, the loop of the voltage dependent resistor 321R1 is still in a conducting state, the series resistor 321 functions to greatly reduce the loop current, and at the same time, the current flowing through the second current fuse 322 of the loop of the voltage dependent resistor 321R1 exceeds the response current thereof, the current fuse 322 fuses to cut off the whole circuit, if the second current fuse 322 fails and the abnormal temperature continues to rise, the second temperature fuse 323 responds to safe disconnection to cut off the whole circuit, thereby performing a double-fuse function.
It should be noted that in this embodiment, the number of the current fuse 322, the second temperature fuse 323, and the resistor 321 may be one or more, which is not limited herein, but these solutions are all within the protection scope of the present invention.
Referring to fig. 4, in a possible embodiment of the present invention, the shutdown loop 2 includes a current fuse 332 and a resistor 331;
a first end of the resistor 331 is electrically connected to the arc extinguishing circuit 3, and a second end of the resistor 331 is connected to a second end of the first thermal fuse 1 through the current fuse 332.
It should be noted that, at the moment when the first thermal fuse 1 is disconnected, the voltage across the varistor 331R1 exceeds the varistor voltage, and the shutdown circuit 2 and the arc extinguishing circuit 3 are instantly turned on (i.e., the dc power supply and the load continue to be turned on), so as to protect the first thermal fuse 1 from instant arc extinguishing and safely disconnect. At the same time, the current flowing through the current fuse 332 in the loop in which the varistor 331R1 is located exceeds the response current thereof, and the current fuse 332 melts to cut off the entire circuit.
It should be noted that in this embodiment, the number of the current fuse 332 and the number of the resistor 331 may be one or more, which is not specifically limited herein, but these solutions are all within the protection scope of the present invention.
Referring to fig. 5, in one possible embodiment of the present invention, the shutdown circuit 2 includes a current fuse 341;
a first end of the current fuse 341 is electrically connected to the arc extinguishing circuit 3, and a second end of the current fuse 341 is connected to a second end of the first temperature fuse 1.
It should be noted that, at the moment when the first thermal fuse 1 is disconnected, the voltage across the varistor R1 exceeds the varistor voltage, and the shutdown circuit 2 and the arc extinguishing circuit 3 are instantly turned on (i.e. the dc power supply and the load are continuously turned on), so as to protect the first thermal fuse 1 from instantly extinguishing the arc, and safely disconnecting the first thermal fuse. At the same time, the current flowing through the second current fuse 341 of the loop in which the varistor R1 is located exceeds the response current thereof, and the current fuse 341 is blown to cut off the entire circuit.
It should be noted that, in this embodiment, the number of the current fuses 341 may be one or more, which is not specifically limited herein, but these solutions are all within the protection scope of the present invention.
In a possible embodiment of the present invention, the second temperature fuse has a higher operating temperature than the first temperature fuse 1.
It should be noted that when the second thermal fuse senses that the abnormal temperature continues to rise, the second thermal fuse responds to the safe disconnection to cut off the whole circuit.
A second embodiment of the present invention provides a circuit breaker, including a thermal fuse assembly as described above.
Based on the utility model provides a pair of temperature fuse subassembly and circuit breaker, in normal course of operation, the electric current of direct current power supply and load passes through first temperature fuse 1, turn-off return circuit 2 and arc extinguishing return circuit 3 are out of work this moment and the electric current can not flow through these two return circuits promptly, and when first temperature fuse 1 perception temperature was unusual, it can automatic and quick fusing, in the twinkling of an eye of fusing, can continue to switch on when arc extinguishing return circuit 3 breaks direct current power supply with the load, in order to realize extinguishing the electric arc that produces when first temperature fuse 1 breaks off, if electric current and/or temperature continue to keep unusual, turn-off return circuit 2 disconnection, cut off whole return circuit, should understand, when turn-off return circuit 2 and arc extinguishing return circuit 3 and switch on for the electric current in return circuit diminishes, at this moment, can not produce electric arc or produce less electric arc, can be extinguished naturally.
Above only the utility model discloses a preferred embodiment, the utility model discloses a scope not only limits in above-mentioned embodiment, and the fan belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope.
Claims (8)
1. A temperature fuse assembly, comprising: a first temperature fuse, a turn-off circuit, and an arc extinguishing circuit;
the two ends of the first temperature fuse are used for connecting a direct current power supply and a load, and the turn-off loop and the arc extinguishing loop are connected in series and then connected with the first temperature fuse in parallel;
the arc extinguishing loop is configured to be capable of continuing to conduct the direct current power supply and the load when the first temperature fuse is sensed to be disconnected, so that an arc generated when the first temperature fuse is disconnected is extinguished;
the shutdown loop is configured to sense current and/or temperature of the loop after the quenching loop is turned on and to be turned off when the current and/or temperature is abnormal.
2. The thermal fuse assembly of claim 1, wherein the quenching circuit comprises a varistor;
the first end of the piezoresistor is connected with the first end of the first temperature fuse, and the first end of the piezoresistor is connected with the turn-off loop.
3. A thermal fuse assembly according to claim 1, wherein said shutdown loop comprises a second thermal fuse, a resistor;
the first end of the resistor is electrically connected with the arc extinguishing loop, and the second end of the resistor is connected with the second end of the first temperature fuse through the second temperature fuse.
4. A temperature fuse assembly according to claim 1, wherein said shutdown loop comprises a current fuse, a second temperature fuse, a resistor;
the first end of the resistor is electrically connected with the arc extinguishing loop, the second end of the second resistor of the resistor is connected with the first end of the current fuse through the second temperature fuse, and the second end of the current fuse is connected with the second end of the first temperature fuse.
5. A thermal fuse assembly according to claim 1, wherein said shutdown loop comprises a current fuse, a resistor;
the first end of the resistor is electrically connected with the arc extinguishing loop, and the second end of the resistor is connected with the second end of the first temperature fuse through the current fuse.
6. A temperature fuse assembly according to claim 1, wherein said shutdown loop comprises a current fuse;
the first end of the current fuse is electrically connected with the arc extinguishing loop, and the second end of the current fuse is connected with the second end of the first temperature fuse.
7. A thermal fuse assembly according to claim 3 or 4 wherein the second thermal fuse has a higher operating temperature than the first thermal fuse.
8. A circuit breaker including a thermal fuse assembly according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221250919.2U CN218769387U (en) | 2022-05-24 | 2022-05-24 | Temperature fuse assembly and circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221250919.2U CN218769387U (en) | 2022-05-24 | 2022-05-24 | Temperature fuse assembly and circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218769387U true CN218769387U (en) | 2023-03-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221250919.2U Active CN218769387U (en) | 2022-05-24 | 2022-05-24 | Temperature fuse assembly and circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218769387U (en) |
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2022
- 2022-05-24 CN CN202221250919.2U patent/CN218769387U/en active Active
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